Internal-combustion engine.



P. BURT.

INTERNALfiOMBUST ION ENGINE.

APPLICATION FILED "5.1,1916 V Patented Dec. 4,1917.

Patented Dec. 4,1917.

5 SHEETS- -S HEET 2- P. BURT.

INTERNAL COMBUSTION ENGINE APPLICATION FILED FEB. 1. ms

llll IL BURT. INTERNAL COMBUSTION ENGINE.

- APPLICATION FILED m. 1. ms 1 1,248,801. Q N Patenwd 1m 4,191

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P, BURT.

APPLICATION FILED FEB 1. ms 1,24 ,301; nted Dec. 4,1917 5 SHEETS-SHEET 5.

UNITED STATES PATENT oFFioE.

PETER BUB/1, OF BOTHWELL, SCOTLAND. I mrnnnan-o'omnns'rxon ENGINE. 1 ,248,801 Bpeclflc atlon of Letters Patent. Patented Dec, 4, 1917,

Application filed February 7, 1916. Serial No. 78,607.

To all whom it may concern;-

Be it known that I, Pn'rna Boar, a subject (if theKingof the United Kingdom of Great Britain anti Ireland, and reslding at Bothwell, Lan arkshi-re, Scotland, have invented a certain new and useful Improvement in InternaLCombustion Engines, of

which the following is a specification.

This invention relates to improvements in internal combustion engines operating on the four-stroke cycle, and of the type where- 'in the cylinder is fitted with an internal sleeve valve device separate from the engine piston and adapted to perform a combined oscillatory and reciprocatory movement.

Though applicable to water -cooled engines, the improvements are devised partly with the object of adapting the sleeve valve to an air-cooled engine, and of obtaining with an" air-cooled engine the advantages attributable to the use of a sleeve valve.

A further object is to provide a simple arrangement which permits of water-cooling in, the case where water cooling is desired'or required.

An. additional object is to provide a construction such that the cylinder need not be subjected to the special operations involved, for example, in cutting in the cylinder wall accurately plottedports for admission and exhaust, the special operations being efi'ect ed on a stationary liner fixed in the interior ofthe cylinder within which the valve telescopes; or the liner'may be double-walled. the space between the walls being traversed short tubes of the requisite caliber and.

contour to tion. V

With the use of such a linerit-is possi ble, for example,

present the desired port formaconjunction with a liner of say cast iron, steel orbrass, such liner forming the valve seat andhaving the necessary heat-resisting qualities or, if double walled'. being in communication with a water cooling system.

passages and ports-such that iecal.

in" the neighborhood-i of the counteracted by the cooling action of the a cold-H airi'and carbureted mixture on the to use a cylinder of.alu;- minum or alloy of a low meltingpomtgin" ay be as far as-fpo'ssible".

parts of the cylinder thereto.

The arrangement whereby this object is accomplished also permits the attainment in close proximity of a maximum port opening, and the convcnient use of a valve each port of'which serves alternately for admission and ex haust, the admission of the relatively cool mixture counteracting to some extent the effect of the heating action of the exhaust gases on the port edges.

.These and other objects are accomplished with the preferred construction of engine hereinafter described, and embodying features of novelty pointed out in the appended a ported liner constructed in accordance with the invention; and Fig. 5 an expanded view showing diagrammatically the form and arrangement of the ports in the liner and in the sleeve valve. 4

As herein shown. the cvlinder 1. which may be of aluminum. and may be provided externally withradiating fins 2, receives at its upper end a stationary tubular liner 3 which. in the case selected for illustration, is doubleavalledfland in which are fitted tubes presenting inlet ports 4 and exhaust ports 5 end also air admission ports 6; the inlet ports 4 and exhaust ports 5 alternatmg.

In 5 the hatched spaces indicatethe portslO formed in the valve 11. r

The dotted elliptical line (1 represents the path of a point on the valve.

A rigid envelop formed with open channels which. when the envelop is in place, afford in conjunction with-channels in the outer walls of the'icylinde'r casting two passages Tand 8 in close proxi'ni'itv'to one; another. is slipped over-the'cylindercast-' The air 1 to-be carburetedflmvs through the passage ing'sc as to be rcad-ilyyremovable;

way of the'ports 6. The inlet ports 4 :for the mixture communicate with the pasgn 8. The exhaust ports 5 communicate with outlet 9.

' quired angleto'control the toan ' treme 50 being rnovab e by t e iipper end of the valve 11, passing throu h the ports 6 to the passage 7, thence past t e carburetor and thence to the assage 8 which communicates with the inet-ports 4.

It will be understood that only in the case of a multi-cylinder engine is there occasion to control by means of the valve the admission of air to the carburetor-such control being desired to insure that each plug shall receive its share of cooling air.

It will be seen that with the arrangement described not only'is the sparking plug kept cool, but also local overheating in the neig borhood of the exhaust ports 5 is to a large extent counteracted.

In the case of the engine illustrated, which is designed t be we r cooled, I provide for water-coo ing the head 18 projecting into the interior of the cylinder, the water jacket for the head .bein in communication with the water jacket ormed in the cylinder-cover 15 with which communicates the open-topped annulbr space between the walls of the liner 3f theflatler bein held in place by a flange projecting outwar 1y from the head 13.

Combined recipfooatory and oscillatory movements may be imparted to the valve by the driving at now to be described.

Eitted on ugs 16 projecting radially from the outer end ofthe valve 11 is a hinge-pin 1] engaging a radial a .ertured arm 18 on a sleeve 19 mounted to s idc on the crank pin 20 of a crank shaft 21 disposed to oneside of the cylinder and driven at half the speed of the engine shaft, the crank .pin 20 being rotatable in. the sleeve 19.

he arrangement is such that in one exposition of the movement .of the taining the axisof the hinge-pin 17 andthe axis of the valvell'is inclined preferabl at su stantially 45 to the axis of'the cran shaft 21 ass 11 in-plan, the hinge-pin 17 inthe direction to decrease such inclination, i. e., toward a position in which said plane is more'ncarly parallel to the axis of the crank shaft 21.

" With this arrangement. on rotation of the crank shaft 21 the valve 11 is recipro cated-and also oscillated through 'the reo'rt openings. 1 It will be appreciated t, at an internal combustion engine constructed sis-described answers, entirely the objects as hereinbcfore manor set forth; the resultant advantages will ap arent to those skilled in the art. I t is" to be understood that the invention in,its broader aspects in not limited to th precise construct ons described her to an particular construction by which the invengtion has been or may be carried into effect, since manly changes may be made in the details of t e parts without departure from the essence and true scope of the actual invention as defined In the adaptation of the improvements to a multi cylinder engine the channeled envelop is shaped to surround the various cylinders, so as in'efl'ectl to form a mono- -bloc engine though the cylinders arecast separately.

hat I claim is 1.'In a four-stroke internal combustion engine, in combination, a cylinder, a cylindrical valve seat fitted in the cylinder, said valve seat provided with" admission and exhaust ports arranged alternately in a single circumferential row, a piston, and a sleeve valve separate from and Surrounding said piston and movablewithinsaid valve seat, 1n a manner to cause points thereon to travel in substantially elliptical paths, said valve formed with ports adapted in the movement of the valve to be brought into and out of register with the ports in the valveseat.

2. In a four stroke internal combustion engine, in combination, a cylinder, a. piston, a water cooled valve seat romovably fitted within the cylinder, said valve seat formed with cylindrical walls spaced apart and \Vlth. cross-tubes traversing the space be-'-'- hinge-pin 17 with the valve 11 a plane contween the walls and presenting admission and exhaust ports, a sleeve valve separate from and able within said valve seat, said valve formed with ports adapted in the move ment of the valve who brought into.and out of register with said admission and exhaust ports, and means for imparting to said valve reciprooatory movements in the direction of the axis of said cylinder and oscillatory movements around said axis.

3. In a four stroke internal combustion by the appended claims.

surrounding the piston and -mo'v-- engine, in combination, a-cylinder, a piston,

a water'co( led valve seat rcmovably fitted within the cylinder, said valve seat formed" with admission and exhaust ports, a sleeve valve separatev from and surrounding the piston and movable within said valve seat, said valve formed with ports adapted in the movement of the valve to be brought into and out of register with said admission and exhaust ports, and means for' imparting to said valve mciprocntory movementsin the direction of the axis of'said cylinder and oscillatory movements nroundlsaid axis. 4. In an internal combustion fengme, m

combination, a cylinder, a piston, a, water cooled valve "seat removably fitted vvithin the cylinder, said valve seat provided with inlet and-exhaust ports arranged. alternately in a single cii-cinnferential row, a sleeve valve 'Separate from and surrounding the "piston and" movable Within. the valve seat in a manner-to cause points thereon totravel in substantially elliptical paths, said valve formed. with 'ports cooperating with ports in the liner, anda cylinder cover formed with ahead projecting into the cylinder and forming a Water jacket.

i 5. In a four-stroke internal coinlnistion e:'igine,.in eoml'iinntion, a cylinder, a piston, a liner forming a valve seat Within the cylinder. said liner formed with douhle walls oonstitnling an opelntoppecl annular space l1.,.1ia & tubes it n h W Hand unli A between the walls and presenting ports, a sleeve valve' separate from and surrounding the piston and movable Within the liner,

said valve formed with. ports cooperating with ports in the hirer, and a cylinder cover forming aater jacket in communication with the annular space; V V i '6.- In a four-stroke internal combustion engine, in combination, a cylinder, a piston,

- a tubular liner forming a valve seat within the cylinder, said liner formed with air ports and with admission and exhaust ports, and a sleeve valve separate frmn and surrounding the piston and movable Within the liner, said valve forined with ports adapted in the moyement of the valve to be brought into and out of register with said admission. and exhaust ports, said valve adapted also to cover and uncoversnid air ports 7. In a 'four'strolre internal combustion engine, in combination, a cylinder, an air duet extending around said cylinder holl W head projecting ifitdlthe eylin' er and formedwith ports for the passage of air, a stationary liner'forming a valve seat {within the cylinder 'formed'with admission and exhaustportsand withair ports, and a sleeve yailve movable with n 'nder'and prowith ports ada ted he naive to brongh nto register with said admission and exhaust ports and to'control said air p'orts whereby to establish and disestablish communication between the lUlLEllOf'Of said head and said air duct. f

In a. tour stroke mternal combustion engme,. in combination, a cylinder formed with external open channels, a removable enjunction with the channels in the cylinder passages for air and for the mixture, a liner within the cylinder formed with admission and exhaust ports and ititli air, ports,' said admission ports being in communication with one of said passages and said airports "lieing'in communication with the other of said passages, and a sleeve valve movable thin ports.

the liner and: set-wing to control said and. serving to control theliner.

10. In a four stroke internal combustion servingto carry.

thesparking plug, said 'velop surrounding said cylinder-and formed I with ni'ternal open channels forming 1n c011 ports of said head to ined with ports permitting the/pas so no t 'mthrough the head n'nd'pastthe sparking plug, on nir duct extending around the cylinder,

and a sleeve valve movable within theliner for controlling the passage of ai n through the ports'in said head and i saidliner to said ai'r'duet."

In testimony whereofl have signed iny to this specificationn the presence name of two subscribingwitnesses.

s'es:, i 1 e v WALLACE Gunmen Ennwmrnnn, HENRY Mason. 

